| 摘要 |
A fuel pumping apparatus for supplying fuel to an internal combustion engine includes a first fluid pressure operable piston movable against the action of a spring to advance the timing of fuel delivery by the apparatus. The spring bears at its end remote from the piston against a spring abutment which is in the form of a further piston. The position of the further piston is controlled by a temperature responsive device and when the engine is hot the further piston is advanced from a first position to a second position. A first stop limits the movement of the first piston under increasing fluid pressure when the further piston is in its first position and is secured to the housing and a second stop limits the movement of the first piston under increasing fluid pressure when the further piston is in its second position the second stop being carried on the further piston.
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